67results about How to "Expand the range of selection" patented technology

The invention relates to a fracturing transmission and high-pressure discharging system. The fracturing transmission and high-pressure discharging system comprises a chassis and is characterized in that a high-power engine, a transfer case, a plurality of variable displacement plunger pumps and a double-acting fracturing pump are arranged on the chassis, the output end of the high-power engine is connected with the input end of the transfer case, the output end of the transfer case comprises a plurality of power take-off ports, and each power take-off port is connected with one variable displacement plunger pump; the variable displacement plunger pumps drive the double-acting fracturing pump through a hydraulic system. The fracturing transmission and high-pressure discharging system further comprises a system radiator and a heat dissipation plunger pump used for driving the system radiator, and the heat dissipation plunger pump is connected with one power take-off port of the transfer case. The power take-off ports of the transfer case and the variable displacement plunger pumps are arranged annularly. The fracturing transmission and high-pressure discharging system has the advantages that hydraulic driving replaces mechanical transmission, and working vibration is reduced; the layout space of a whole vehicle is saved, and meanwhile, operating efficiency and the stability of the whole vehicle are improved.

The invention discloses an angular position feedback module of a sun photovoltaic tracking system. The angular position feedback module is composed of a shell (1), a rotary encoder (2), a coded disc installation rack (3), a module base (4), a connecting rod (5), a limiting switch (6), a sliding block, a central shaft combination (8) and a flexible coupling (9). The shell (1) covers the module base (4), the rotary encoder (2), the coded disc installation rack (3), the limiting switch (6), the sliding block (7), the upper half part of the central shaft combination (8) and the flexible coupling (9) are sealed in a seal cavity consisting of the shell (1) and the module base (4). By integrating two functions of angular size feedback and extreme position alarming, the angular position feedback module provided by the invention has high integral protection level in comparison with the way of using independent components; meanwhile, the protection design for a sensor is added, a limiting angleis convenient for adjusting, the transport and installation are convenient; therefore, the angular position feedback is more stable and reliable.

The present invention provides a reading device of the position of an output shaft and a servo system. The servo system comprises at least one output shaft, and each output shaft is provided with an absolute encoder; the reading device comprises: at least one cylinder number obtaining module consisting of at least one input end, wherein the inputting ends of the cylinder number obtaining modules is in one-to-one correspondence with the output shafts; each input end of the cylinder number obtaining module is connected with the output end of the absolute encoder on the corresponding output shafts; the servo system also comprises a single-chip microcomputer, after the single-chip microcomputer receives a reading instruction emitted by the master control device, the single-chip microcomputer controls the cylinder number obtaining module to obtain the cylinder number of the rotation of the output shaft required by the reading instruction and sends the obtained cylinder number to the master control device through a serial port. The servo system and the reading device of the position of the output shaft employ the reading device to read the absolute position of a plurality of output shafts so as to reduce the number serial ports of the master device, reduce the cost and enlarge the model selection range of the master control device in the servo system application.

The invention discloses a forklift positioning method, a forklift and a computer readable storage medium. The method comprises steps that left laser radar data and right laser radar data are acquiredrespectively; Scan Match processing is carried out on the left laser radar data and the right laser radar data to obtain state estimation between frames, and error estimation and variance of the stateestimation are obtained at the same time; state estimation of a wheel disc encoder odometer is obtained through the wheel disc encoder odometer; time synchronization of the obtained laser radar dataand the odometer data of a wheel disc encoder are carried out; and Kalman filtering on the data subjected to time synchronization is carried out to obtain optimal state estimation. The method is advantaged in that the pose and the state of a forklift can be estimated more accurately, navigation precision is improved, the obstacle avoidance function is realized, meanwhile, a model selection range of the two-dimensional laser radar can be increased, and cost is reduced.

The invention provides an intelligent integrated building terminal system. The system includes a data acquisition module, a communication module, a human-machine interface module and an execution adjustment module, wherein the data acquisition module is used for collecting the environment inside a building and an operating state of a system actuator in real time, the communication module is used for transmitting data collected by the data acquisition module to management software of the terminal system and analyzing and processing the collected data, the human-machine interface module is usedfor collecting the data information, optimizing visualization of the data information and providing a control port and a related parameter input port for a user, and the execution adjustment module isused for receiving data analysis instructions of the terminal system and controlling and adjusting the system actuator. The system is advantaged in that data acquisition localization, network control, function integration and cost saving of each device can be realized, and information resource sharing and standardization are further improved.

The invention discloses a hoisting device for building blast furnaces. The technical schemes of the invention comprise that: the hoisting device is provided with an annular hanging beam and a horizontal hanging beam; the annular hanging beam is arranged horizontally and the annular hanging beam is supported by platforms which are fixed to a shell of a blast furnace and contact with the circumference of the annular hanging beam; the horizontal hanging beam has an elongated strip shape and is arranged horizontally below the annular hanging beam, and a centre portion of the horizontal hanging beam has an articulated connection with a centre portion of the annular hanging beam through a center hinge axle; two end portions of the horizontal hanging beam are arranged on an annular track of the annular hanging beam through circling pulleys; and a trolley is arranged on a track of the horizontal hanging beam through a pulley of the horizontal hanging beam. The hoisting device can realize that materials are swung safely at different height levels. Compared with the prior arts, the hoisting device of the invention has the advantages that: manual workload is reduced greatly; a building construction period is shortened by nearly 50%; labor efficiency is improved; material damages are avoided during construction processes; economic benefit is improved; and type selecting scopes of furnace bottom materials and hearth materials are extended.

The invention relates to a control method for a diesel locomotive cooling system. The diesel water outlet temperature W in a cooling water loop and the diesel air inlet temperature A in a pressurized air loop are detected, and when the diesel water outlet temperature W=TWL or the air inlet temperature A=TAL, a fan is started; when the diesel water outlet temperature meets the formula TWL<=W<TWH, or the air inlet temperature A meets the formula TAL<=A<TAH, the fan rotating speed R meets the formula RL<=R<RH, and the fan rotating speed R is adjusted linearly relative to the water outlet temperature or the air inlet temperature; when the diesel water outlet temperature W>=TWH, or the air inlet temperature A>=TAH, the fan rotating speed R=RH. Under the condition that the diesel without an intercooler is adopted in a locomotive, the cooling system needs to cool high-temperature water of the diesel and cool pressurized air of the diesel, the control problem of cooling the high-temperature water of the diesel and the pressurized air of the diesel at the same time is solved well, and therefore the model selection range of the locomotive diesel is enlarged.

A middle-high voltage series-connection electronic switch comprises a main electronic power switch module, a basic dynamic voltage-sharing resistance-capacitance branch formed by a non-polarized capacitor (C1) and a resistor (R1) in series connection, an H bridge diode rectifying module, an attached dynamic voltage-sharing resistance-capacitance branch, a discharging resistor and a surge absorption module, wherein the input end of the H bridge diode rectifying module is connected with the basic dynamic voltage-sharing resistance-capacitance branch, the output end of the H bridge diode rectifying module is connected with the attached dynamic voltage-sharing resistance-capacitance branch, two ends of the attached dynamic voltage-sharing resistance-capacitance branch are further connected with a surge absorption module metal oxide varistor (MOV) in parallel, the attached dynamic voltage-sharing resistance-capacitance branch is formed by a capacitor (C2) and a current-limiting resistor (R2) in series connection mode, and two ends of the capacitor (C2) are further connected with the discharging resistor (Rp) in parallel. The middle-high voltage series-connection electronic switch enables a system to meet general dynamic voltage-sharing requirements and meet requirement for short-time voltage shock absorption under the condition of not adding resistance-capacitance branch power consumption, and is long in service life and high in self-adaption degree.

The invention relates to the technical field of microbial fermentation bed breeding, in particular to a microbial fermentation bed pig breeding method. The bottom of the fermentation bed body directly adopts a dug soil pit bottom as the bottom, and a hardened waterproof interlayer is arranged on the periphery of the bed body; the depth of a bed body of the fermentation bed is 500-800mm, the interior of the bed body is divided into three layers, the thickness of the bottom layer is 100-170mm, corn straws, sorghum straws and the like are rubbed and then directly laid, and no microbial inoculum is added; the thickness of the middle layer is 180-230 mm, and after rice husk and corn straw powder are laid, a lactic acid bacteria agent is sprayed according to the mass ratio of 9: 1; the thickness of the surface layer is 120-170mm, after rice husks are laid, an EM microbial agent is sprayed on the surfaces of the rice husks according to the mass ratio of 7: 1-7: 3, and then clear water is sprayed to enable the temperature of the surface layer to be kept at 38-42 DEG C. The purpose is to improve feed utilization rate and reduce pollution.

The invention discloses a motor phase current sampling method and device. The method comprises the steps of determining a target boundary region, wherein the target boundary region is a boundary region in an invalid region where phase current cannot be reconstructed; obtaining a target response curve of the DC bus current in the target boundary area and a target sampling point of the DC bus current, the target response curve being a pre-predicted response curve of the DC bus current when a motor sends a control signal; and determining whether to perform translation processing on the target sampling point according to the target response curve and the target sampling point. According to the invention, the technical problems of high cost and poor control effect of single-resistor current sampling in the prior art are solved.

The invention provides a feeding device of a cooling water filter. The feeding device comprises an assembling table and a feeding frame, the feeding frame is arranged on the rear side of the assembling table, supports are arranged on the left side and the right side of the feeding frame, the lower end of the supports is fixed with a base, an anchoring hole is formed in the upper end face of the base, a through hole is formed in the upper end face of the support, a threaded rod is arranged in the through hole, a carrier plate is fixed at the lower end of the threaded rod, the lower end surfaceof the carrier plate is provided with a hydraulic cylinder, the lower end of the hydraulic cylinder is fixedly with a connecting plate, the connecting plate is fixedly connected with the feeding frame, the threaded rod is provided with a first nut and a second nut, the first nut is arranged on the upper side of the supports, and the second nut is arranged on the lower side of the supports. Compared with the related technology, the feeding device has the beneficial effects that the purpose of adjusting the mounting position of the hydraulic cylinder is achieved, the selection range of the hydraulic cylinder is enlarged, and the universality is improved.

The invention provides a control method of an isolated power supply based on a non-isolated power supply chip, comprising: connecting with a power supply VI, loading a voltage to the main coil LPRI of a coupling conductor, and storing energy until a power switch Q1 is turned off; from the secondary coil LSEC of the coupling conductor, transmitting the voltage to an output capacitor C and a load resistor R through an output diode CR1; processing an output voltage VO, comparing the voltage with the reference voltage Vref in an error amplifier, and then the error amplifier outputting a corresponding input voltage VE to a non-isolated power supply control chip; and the non-isolated power supply control chip performing corresponding adjustment on a duty ratio through the output voltage VE of the error amplifier, thereby controlling energy storage in the main coil LPRI of the coupling conductor, completing output voltage VO control, and substantially enlarging the chip type selecting range of isolated power supply design.

The invention relates to a hybrid drive system and a vehicle. The system comprises an engine, a first motor, a transmission and an output part; a power shaft of the first motor is coaxially connectedwith an output shaft of the engine; the transmission is located between the engine and the first motor and comprises a double clutch, a first gear set and a second gear set, an output shaft of the engine is connected with an input end of the double clutch, a first output shaft of the double clutch is connected to the first gear set, and a second output shaft of the double clutch is connected to the second gear set; the output part is used for outputting power transmitted by the first gear set or the second gear set so as to drive the vehicle.

The invention discloses a construction method of a PCB (Printed Circuit Board) packaging model. The method comprises the steps of designing and drawing a PCB packaging model corresponding to a high-voltage component according to a packaging schematic diagram recommended in high-voltage component data and a PCB through hole bonding pad manufacturing standard; according to the electrical gap and the creepage distance which need to be met by the high-voltage component in the actual circuit, determining the minimum value of the distance between the edges of the adjacent bonding pads in the actual PCB packaging, and judging whether the distance between the edges of the adjacent bonding pads in the drawn PCB packaging model reaches the minimum value or not; and if the result is not reached, carrying out pad design optimization on the drawn PCB packaging model, and optimizing the shape of a pad into an oval shape. According to the method provided by the invention, when the pin spacing of the high-voltage device meets the requirement of the creepage distance and the packaging bonding pad for PCB packaging does not meet the safety condition, the design of the bonding pad can be optimized according to the method provided by the invention, so that the PCB packaging model obtained after optimization can meet the requirement of the creepage distance, the through-flow can be increased, and the cost can be saved.